问题
What do you think is the better way to go about storing a few image id's inside a record in a MySQL database? It's just the image id's which will be used to fetch the images from a different library.
Do i implode the id's in the record like 1#4#7#9#10#12 or do I just serialize the array and store that? Are there any performance benefits by using the one instead of the other? Stability preferences?
I have just always used implode and explode, never really gave it much thought. Thanks.
回答1:
I would pefer serialize or JSON-encode.
It is more flexible and for example will allow you to add image title and other details there in future...
回答2:
If you don't want to (over?)normalize your tables, and you really just want to store a list of ids then I suggest using a simple comma-separated list, because already MySQL has some functions which can directly deal with comma-separated string values:
FIND_IN_SET:
http://dev.mysql.com/doc/refman/5.0/en/string-functions.html#function_find-in-set
SELECT FIND_IN_SET('b','a,b,c,d'); --> 2
CONCAT_WS: http://dev.mysql.com/doc/refman/5.0/en/string-functions.html#function_concat-ws
SELECT CONCAT_WS(',','First name',NULL,'Last Name'); --> 'First name,Last Name'
Of course, you won't be able to do SQL JOINs, but it still can be helpful.
回答3:
As far as I know there are not significant differences in this case but implode() is a bit faster since it assumes an array and serialize() does not know what you are passing to it.
EDIT based on OP's comment:
Well all the images are stored in a seperate library table with the title and descriptions and things like that. But yeah I see your point.
In that case is not a good idea so serialize several IDs into a single field. What you need is a *-to-Many relation between your 2 tables. This is the correct way of represent multivalued fields:
+----------------------+
| USER |
+---------+------+-----+
| user_id | name | ... |
+---------+------+-----+
+----------------------+
| USER_PICTURE |
+---------+------------+
| user_id | picture_id |
+---------+------------+
+--------------------------+
| PICTURE |
+------------+-------+-----+
| picture_id | title | ... |
+------------+-------+-----+
回答4:
My friend, serialization is to obtain a string representation of an object's status. Even if it works i don't think is the best way to do what you want. I would prefer to store a json object with the ids. Because a json object is multiplatform, is a string and is easily readable by a human i think is a good approach.
来源：https://stackoverflow.com/questions/13197255/serialize-vs-implode